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<body>
<script type="text/jscript">
function tinh(diemhk1,diemhk2)
{
dtb = (eval(diemhk1)+eval(diemhk2)*2)/3;
if(dtb<=10)
xl.innerText = "Giỏi";
else if(dtb<8)
xl.innerText= "Khá";
else if(dtb<6.5)
xl.innerTextt="Trung bình";
else if(dtb<5)
xl.innerTextt="Yếu";
else...